Errors:
Attribute “xmlns:og” not allowed here.
Attribute “xmlns:fb” not allowed here.
CSS: “color”: “#fffffff” is not a valid color 3 or 6 hexadecimals numbers.
Bad value for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…-2x-500.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-5x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-4x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…-2x-500.png 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-5x.png 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-4x.png 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/04/GN-7948-thegem-portfolio-justified-2x-500.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/04/GN-7948-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…-2x-500.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/04/GN-7948-thegem-portfolio-justified-fullwidth-5x.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/04/GN-7948-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-5x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/04/GN-7948-thegem-portfolio-justified-fullwidth-4x.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/04/GN-7948-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-4x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/tube-thegem-portfolio-justified-2x-500.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/tube-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…-2x-500.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/tube-thegem-portfolio-justified-fullwidth-5x.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/tube-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-5x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/tube-thegem-portfolio-justified-fullwidth-4x.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/tube-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-4x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/gucci-thegem-portfolio-justified-2x-500.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/gucci-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…-2x-500.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/gucci-thegem-portfolio-justified-fullwidth-5x.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/gucci-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-5x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/gucci-thegem-portfolio-justified-fullwidth-4x.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/gucci-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-4x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/apple-thegem-portfolio-justified-2x-500.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/apple-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…-2x-500.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/apple-thegem-portfolio-justified-fullwidth-5x.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/apple-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-5x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Bad value “https://www.cobraart.nl/wp-content/uploads/2017/07/apple-thegem-portfolio-justified-fullwidth-4x.jpg 1x, https://www.cobraart.nl/wp-content/uploads/2017/07/apple-thegem-portfolio-justified.jpg 2x” for attribute “srcset” on element “source”: Expected width descriptor but found “1x” at “…idth-4x.jpg 1x,”. (When the “sizes” attribute is present, all image candidate strings must specify a width.)
Character reference was not terminated by a semicolon.
No space between attributes.
Attribute “background” not allowed on element “input” at this point.
Attribute “;” not allowed on element “input” at this point.
Warnings:
Attribute with the local name “xmlns:og” is not serializable as XML 1.0.
Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.
The “type” attribute for the “style” element is not needed and should be omitted.
The “type” attribute is unnecessary for JavaScript resources.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
Attribute “;” is not serializable as XML 1.0.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.